Concept of health and disease MCQs With Answer
The concept of health and disease is foundational for B.Pharm students, linking pathophysiology, epidemiology, etiology, diagnosis, prevention, and treatment. Understanding definitions (health, disease, illness), models (biomedical, biopsychosocial), natural history, and measures like incidence, prevalence, morbidity, and mortality prepares pharmaceutical graduates for clinical pharmacology, public health, and drug therapy decision-making. Key topics include host–agent–environment interactions, risk factors, stages of disease, screening principles, diagnostic test validity, and prevention strategies. This collection of targeted MCQs emphasizes critical thinking for patient care, pharmacotherapy, and preventive medicine. Now let’s test your knowledge with 30 MCQs on this topic.
Q1. What is the World Health Organization (WHO) definition of health?
- A state of complete physical, mental and social well-being and not merely the absence of disease or infirmity
- The absence of any detectable disease based on laboratory tests
- Ability to perform work without fatigue
- Absence of infectious agents in a population
Correct Answer: A state of complete physical, mental and social well-being and not merely the absence of disease or infirmity
Q2. Which term best describes the subjective experience of feeling unwell?
- Diagnosis
- Illness
- Disease
- Syndrome
Correct Answer: Illness
Q3. Which model emphasizes biological mechanisms and pathological changes as the basis of disease?
- Biopsychosocial model
- Ecological model
- Biomedical model
- Social determinants model
Correct Answer: Biomedical model
Q4. Pathogenesis refers to:
- The genetic predisposition only
- The origin and development of disease, including mechanisms and sequence of events
- The public health measures to prevent disease
- The period between exposure and first symptoms
Correct Answer: The origin and development of disease, including mechanisms and sequence of events
Q5. Which measure indicates the proportion of a population with a disease at a specific time?
- Incidence rate
- Prevalence
- Mortality rate
- Case fatality rate
Correct Answer: Prevalence
Q6. Incidence rate measures:
- The number of existing cases at a point in time
- The number of new cases occurring in a specified time period in a population at risk
- The proportion of deaths among diseased individuals
- The total population size
Correct Answer: The number of new cases occurring in a specified time period in a population at risk
Q7. Which of the following best defines etiology?
- The clinical presentation of symptoms
- The cause or set of causes of a disease
- The statistical distribution of disease in a population
- The recovery process after treatment
Correct Answer: The cause or set of causes of a disease
Q8. What is the incubation period?
- Time from onset of symptoms to death
- Time from exposure to infectious agent to appearance of symptoms
- Duration of immunity after vaccination
- Time between disease diagnosis and recovery
Correct Answer: Time from exposure to infectious agent to appearance of symptoms
Q9. Which term refers to the ability of a pathogen to produce disease?
- Infectivity
- Pathogenicity
- Virulence
- Contagiousness
Correct Answer: Pathogenicity
Q10. Virulence is best described as:
- The ability to colonize a host without symptoms
- The capacity of a microorganism to cause severe disease or death
- Number of people exposed to an agent
- The effectiveness of a vaccine
Correct Answer: The capacity of a microorganism to cause severe disease or death
Q11. Case fatality rate is defined as:
- Number of deaths in entire population per year
- Proportion of individuals with a particular disease who die from that disease
- Incidence of new deaths from all causes
- Rate of disease recurrence
Correct Answer: Proportion of individuals with a particular disease who die from that disease
Q12. Which prevention level aims to reduce disease incidence by preventing exposure to risk factors?
- Tertiary prevention
- Secondary prevention
- Primary prevention
- Quaternary prevention
Correct Answer: Primary prevention
Q13. Secondary prevention primarily involves:
- Health promotion activities for healthy people
- Early detection and treatment to halt progression of disease
- Rehabilitation to reduce disability
- Elimination of environmental risk factors only
Correct Answer: Early detection and treatment to halt progression of disease
Q14. Which describes tertiary prevention?
- Vaccination to prevent infection
- Screening of asymptomatic individuals
- Rehabilitation and measures to reduce complications in established disease
- Health education for the general population
Correct Answer: Rehabilitation and measures to reduce complications in established disease
Q15. In epidemiology, a reservoir is:
- A measurement instrument for incidence
- The environment or host where an infectious agent normally lives and multiplies
- A public health storage facility for vaccines
- A metric of disease severity
Correct Answer: The environment or host where an infectious agent normally lives and multiplies
Q16. Host–agent–environment triad highlights:
- The exclusive role of genetics in disease
- Interactions among a susceptible host, a causative agent, and environmental factors in producing disease
- Only behavioral causes of disease
- Laboratory methods for diagnosing disease
Correct Answer: Interactions among a susceptible host, a causative agent, and environmental factors in producing disease
Q17. Sensitivity of a diagnostic test is the:
- Proportion of true negatives correctly identified
- Proportion of true positives correctly identified
- Probability that a positive test reflects disease absence
- Proportion of population tested
Correct Answer: Proportion of true positives correctly identified
Q18. Specificity of a test refers to:
- Ability to detect disease in all stages
- Proportion of true negatives correctly identified
- Proportion of false positives among tested
- Overall accuracy independent of disease prevalence
Correct Answer: Proportion of true negatives correctly identified
Q19. Positive predictive value (PPV) depends on:
- Test accuracy only, independent of prevalence
- Disease prevalence in the tested population and test specificity and sensitivity
- Number of tests performed daily
- Host immunity alone
Correct Answer: Disease prevalence in the tested population and test specificity and sensitivity
Q20. Endemic disease means:
- Disease present at a constant or predictable level in a population
- Sudden increase in cases above expected levels
- Worldwide spread of a new disease
- Disease confined to animals
Correct Answer: Disease present at a constant or predictable level in a population
Q21. An epidemic is best defined as:
- Persistent low-level disease occurrence
- Increase in cases of a disease above expected baseline in a population
- Global distribution of a disease
- Only diseases transmitted by vectors
Correct Answer: Increase in cases of a disease above expected baseline in a population
Q22. Pandemic refers to:
- Local outbreak limited to one city
- Global epidemic affecting multiple countries or continents
- An outbreak confined to hospitals
- Endemic disease that becomes chronic
Correct Answer: Global epidemic affecting multiple countries or continents
Q23. Herd immunity helps control infectious diseases by:
- Eradicating all pathogens from the environment
- Reducing susceptible individuals so transmission is interrupted when a critical proportion is immune
- Replacing clinical treatment with vaccination only
- Masks and social distancing exclusively
Correct Answer: Reducing susceptible individuals so transmission is interrupted when a critical proportion is immune
Q24. A nosocomial infection is:
- An infection present at birth
- An infection acquired in a hospital or healthcare setting
- A sexually transmitted infection
- An infection prevented by vaccination
Correct Answer: An infection acquired in a hospital or healthcare setting
Q25. Iatrogenic disease is caused by:
- Genetic mutations only
- Medical treatment or diagnostic procedures
- Environmental toxins exclusively
- Unknown agents
Correct Answer: Medical treatment or diagnostic procedures
Q26. A syndrome is best described as:
- Single specific disease with known etiology
- A set of medical signs and symptoms correlated with each other and often associated with a particular disease
- Only psychological disorders
- A laboratory technique
Correct Answer: A set of medical signs and symptoms correlated with each other and often associated with a particular disease
Q27. Which is a non-communicable disease risk factor example?
- Airborne virus exposure
- High blood pressure
- Contaminated water ingestion
- Direct person-to-person contact
Correct Answer: High blood pressure
Q28. Which statement about acute vs chronic disease is correct?
- Acute diseases always lead to death while chronic never do
- Acute diseases have rapid onset and short duration; chronic diseases develop slowly and persist over long periods
- Chronic diseases are always infectious
- Acute diseases cannot be treated pharmacologically
Correct Answer: Acute diseases have rapid onset and short duration; chronic diseases develop slowly and persist over long periods
Q29. In drug development and clinical pharmacology, understanding disease natural history is important to:
- Ignore patient variability in trials
- Determine appropriate endpoints, timing of interventions, and expected outcomes for therapy
- Ensure tests are always 100% accurate
- Replace epidemiology with lab research
Correct Answer: Determine appropriate endpoints, timing of interventions, and expected outcomes for therapy
Q30. Which concept links public health prevention and clinical pharmacotherapy most directly?
- Pharmacokinetics only
- Health promotion unrelated to medication use
- Risk factor modification and evidence-based therapeutic interventions to reduce disease burden
- Laboratory assay precision only
Correct Answer: Risk factor modification and evidence-based therapeutic interventions to reduce disease burden
